The Winchesters are taken to a government black site in theRocky Mountain National Park, where they are locked in separate cells until they are willing to talk. After nearly two months, they are found dead by the guards, but suddenly revive and escape. At the same time, Mary along with grace and Castiel attempt to find them without luck. With the Winchesters gone, monster activity goes on the rise and Castiel begins to see just how important his friends and bella are. After escaping, the Winchesters contact Castiel to meet them when they get out of the forest and go on the run from government soldiers. Sam bella and Dean are able to defeat the soldiers, then reunite with Castiel grace and Mary, who have found them with the help of Mick and Ketch. Driving away, they are stopped by Billie and it is revealed that the Winchesters made a deal with her in which they would temporarily die and come back in exchange for a Winchester dying permanently at midnight or face cosmic consequences. Mary chooses to sacrifice herself for her sons and daughter , but Castiel kills Billie instead, telling the horrified Winchesters that they are all too important for the world to lose. At the same time, Mick unsuccessfully attempts to make connections with the American hunters. However, when Mick approaches Mary, she is shown to be more open to listening since he helped rescue Sam bella and Dean, though she is unaware that Mick had Ketch kill everyone at the black site so as to leave no "loose ends